To provide a bead core restrained from a bead wire's float to an outer diameter side and a pneumatic tire comprising the bead core.SOLUTION: A bead core 31 comprises: a bead wire bundle body 32 having a cyclic body 32a made of a plurality of windings of at least one bead wires 35, a winding start part 35a of the bead wire 35, and a winding end part 35b of the bead wire 35 and having an overlapping region X1 which makes the winding start part 35a and the winding end part 35b overlap on the circumference of the body 32a; and a fastening thread 33 wound around the bead wire bundle body 32 to hold the winding start part 35a and the winding end part 35b along the body. The angle range α2 of the fastening region with the wound fastening thread is set at ±4° or more and ±30° or less around the axis O1 of the bead wire bundle body 32 centering on the intermediate position P0 in the circumferential direction of the overlapping region X1.SELECTED DRAWING: Figure 4
【課題】ビードワイヤの外径側への浮きが抑制されたビードコア及びビードコアを備えた空気入りタイヤを提供する。【解決手段】ビードコア31は、少なくとも1本のビードワイヤ35が複数回巻回された環状の本体32aと、ビードワイヤ35の巻始め部分35aと、ビードワイヤ35の巻終わり部分35bとを有し、巻始め部分35aと巻終わり部分35bとが本体32aの周上で重複する重複領域X1を有するビードワイヤ収束体32と、ビードワイヤ収束体32に巻き付けられて、巻始め部分35aと巻終わり部分35bを本体に沿わせて保持する留め糸33と、を備え、留め糸が巻き付けられた結束領域の角度範囲α2は、重複領域X1の周方向の中間位置P0を中心にビードワイヤ収束体32の軸心O1周りに±4度以上±30度以下に設定されている。【選択図】図4
BEAD CORE AND PNEUMATIC TIRE COMPRISING BEAD CORE
ビードコア及びビードコアを備えた空気入りタイヤ
2024-08-16
Patent
Electronic Resource
Japanese
IPC: | B60C VEHICLE TYRES , Fahrzeugreifen |
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